Organic-inorganic hybrid layer-by-layer electrostatic self-assembled film of cationic dye Methylene Blue and a clay mineral: Spectroscopic and Atomic Force microscopic investigations

2017 ◽  
Vol 187 ◽  
pp. 322-332 ◽  
Author(s):  
Utsav Chakraborty ◽  
Tanmoy Singha ◽  
Russell R. Chianelli ◽  
Chaitali Hansda ◽  
Pabitra Kumar Paul
Keyword(s):  
Methylene Blue ◽  
Clay Mineral ◽  
Layer By Layer ◽  
Cationic Dye ◽  
Hybrid Layer ◽  
Inorganic Hybrid ◽  
Atomic Force ◽  
Self Assembled ◽  
Microscopic Investigations

Polyoxometalates-based heterometallic organic–inorganic hybrid materials for rapid adsorption and selective separation of methylene blue from aqueous solutions

2015 ◽  
Vol 51 (16) ◽  
pp. 3336-3339 ◽  
Author(s):  
Fei-Yan Yi ◽  
Wei Zhu ◽  
Song Dang ◽  
Jian-Ping Li ◽  
Dai Wu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Aqueous Solutions ◽  
Hybrid Materials ◽  
Selective Separation ◽  
Adsorption Rate ◽  
Cationic Dye ◽  
High Uptake ◽  
Uptake Capacity ◽  
Inorganic Hybrid ◽  
Rapid Adsorption

A series of POMs-based hybrid materials exhibit rapid adsorption rate, high uptake capacity and excellent selective separation towards cationic dye.

scholarly journals Fabrication and Characterization of Antibacterial-active Multilayer Films Based on Keggin Polyoxometalates and Methylene Blue

2010 ◽  
Vol 65 (2) ◽  
pp. 140-146 ◽  
Author(s):  
Dan Chen ◽  
Jun Peng ◽  
Haijun Pang ◽  
Pengpeng Zhang ◽  
Yuan Chen ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Self Assembly ◽  
Multilayer Films ◽  
Photoelectron Spectra ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Assembly Technique ◽  
Lbl Films ◽  
Cv Measurements

Two kinds of multilayer films based on Keggin polyoxometalates α-[SiW12O40]4−/α- [PMo12O40]3− and methylene blue have been prepared via the layer-by-layer (LBL) self-assembly technique. The multilayer films were characterized by UV/Vis spectra, atomic force microscopy (AFM) and X-ray photoelectron spectra (XPS). The cyclic voltammetry (CV) measurements have demonstrated that the electrochemical properties of POMs are maintained in the LBL films. The antibacterial activity of the LBL films has also been investigated, which shows a distinct antibacterial effect against Escherichia coli.

DYNAMIC BEHAVIOR OF METHYLENE BLUE ON E. coli K30 CAPSULAR POLYSACCHARIDE USING LAYER BY LAYER SELF-ASSEMBLY TECHNIQUE

2020 ◽  
pp. 2050027
Author(s):  
BANDANA DAS ◽  
ALPANA BAIDYA ◽  
SANTANU MAJUMDER ◽  
RANENDU KUMAR NATH
Keyword(s):  
Thin Film ◽  
Methylene Blue ◽  
Dynamic Behavior ◽  
Self Assembly ◽  
Capsular Polysaccharide ◽  
Layer By Layer ◽  
Cationic Dye ◽  
Bacterial Polysaccharide ◽  
E Coli ◽  
Assembly Technique

Layer-by-layer (LbL) self-assembly is one of the unique methods for fabrication of ultra-thin film. This technique has immense application aross many fields in today’s life. In this paper, we have presented the fabrication of the thin film comprising of antifungal and antibacterial cationic dye methylene blue with negatively charged E. coli K30 bacterial polysaccharide sharing with PAH. The multilayers were characterized by UV–Vis absorption spectra and AFM. Various photophysical behaviors were investigated. Such studies provide a new light in the research of layer by layer self-assembly technique.

DNA Electrochemical Biosensor Based on Chitosan and Gold Nanoparticles Using Methylene Blue as Electrochemical Indicator

2011 ◽  
Vol 298 ◽  
pp. 128-134
Author(s):  
Ai Chun Zhang ◽  
Cun Zhou
Keyword(s):  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Electrochemical Biosensor ◽  
Gold Atom ◽  
Modified Electrodes ◽  
Layer By Layer ◽  
Adsorption Effect ◽  
Dna Electrochemical Biosensor ◽  
Modified Dna ◽  
Self Assembled

In this paper, a novel DNA electrochemical biosensor based on layer-by-layer self-assembled technology was reported. Gold nanoparticles were firstly immobilized on chitosan modified gold electrode by large amino of chitosan because of strong electrostatic adsorption effect between amino and gold atom, and thoil group modified DNA (SH-ssDNA) probe sequence was then self-assembled onto the electrode. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were applied to investigate the electrochemical behavior of different modified electrodes with methylene blue as hybrid indicator. The results in optimization experiment condition show that: The peak current difference value pre and post hybridization was linearly related to the logatithmic value of the target DNA concentration ranging from 10-8~10-5mol/L.A detection limit of 3.55×10-9mol/L can be estimated.

scholarly journals Preparation and Antifouling Property of Polyurethane Film Modified by PHMG and HA Using Layer-by-Layer Assembly

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 934
Author(s):  
Huihui Yuan ◽  
Chenli Xue ◽  
Jiaqian Zhu ◽  
Zhaogang Yang ◽  
Minbo Lan
Keyword(s):  
Protein Adsorption ◽  
Bacterial Adhesion ◽  
Attenuated Total Reflection ◽  
Layer By Layer ◽  
Water Contact ◽  
Antibacterial Performance ◽  
Atomic Force ◽  
Polyurethane Film ◽  
Self Assembled ◽  
Self Assembled Layer

To reduce the possibility of bacterial infection and implant-related complications, surface modification on polyurethane (PU) film is an ideal solution to endow hydrophobic PU with antibacterial and antifouling properties. In this work, a variety of polyhexamethylene guanidine/ hyaluronic acid (PHMG/HA) multilayer films were self-assembled layer-by-layer on PU films using polyanions, carboxyl-activated HA, and polycations PHMG by controlling the concentration of these polyelectrolytes as well as the number of layers self-assembled. Attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) spectra, water contact angle (WCA), and A Atomic force microscope (AFM) of PU and modified PU films were studied. Protein adsorption and bacterial adhesion as well as the cytotoxicity against L929 of the film on selected PU-(PHMG/HA)5/5-5 were estimated. The results showed that PU-(PHMG/HA)5/5-5 had the best hydrophilicity among all the prepared films, possessing the lowest level of protein adsorption. Meanwhile, this film showed efficient broad-spectrum antibacterial performance as well as significant resistance of bacterial adhesion of more than a 99.9% drop for the selected bacteria. Moreover, almost no influence on cell viability of L929 enhanced the biocompatibility of film. Therefore, the modified PU films with admirable protein absorption resistance, antimicrobial performance, and biocompatibility would have promising applications in biomedical aspect.

scholarly journals Encapsulation of cells in gold nanoparticle functionalized hybrid Layer-by-Layer (LbL) hybrid shells – Remote effect of laser light

2021 ◽  
Vol 5 ◽  
pp. 100111
Author(s):  
Louis Van der Meeren ◽  
Joost Verduijn ◽  
Jie Li ◽  
Ellen Verwee ◽  
Dmitri V. Krysko ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Laser Light ◽  
Layer By Layer ◽  
Hybrid Layer
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